Here's a quick and dirty, cheap and sturdy, aluminum rack made from Home Depot hardware for about $20. It replaces the rear seat. An easy afternoon project requiring only a vise, hack saw, electric drill, and a few hand tools.
This rack is made from a single 8' piece of 1/8" X 1" aluminum bar stock, held together with 10 3/4 X 1/4-20 stainless machine screws and nylock nuts. Dimensions of the rack are 7" X 14". Attachment to the bike is with the 3 existing rear seat bolts and 2 fender bolts. It's sturdy enough to support my 250lb fat ass without bending. My purpose is to attach a plastic milk crate or camping gear.
